Solar term reflects the laws of the sun

Solar terms in terms of substance is belong to the category of the Gregorian calendar, which is based on the earth around the sun (tropical year) to develop service cycle.So the date of the solar terms in the Gregorian calendar change range is very small.Every month in the Gregorian calendar is a solar term with a gas, always around 6 a month in the first half of the throttle, gas is always around 21;In the second half of the solar terms are always around 8, a month, gas is always around 23.Generally differ at most a day or two, so it's easy to memory.

Throttle and agriculture, climate has a close relationship, it is the ancient working people to adapt to our country days, take agricultural harvest, in the long-term production practice.It integrated the astronomy and phenology, agricultural meteorological experience.Throttle is an important part of the lunar calendar, is our ancestors on the calendar, a unique creation, in the lunar calendar, as the beginning of the four seasons, is originated in the solar terms, such as spring beganThe Spring FestivalOf summer, began in the summer day, autumn began in the beginning of autumn day, winter started in the beginning of winter's day.

24 solar terms of the year, they respectively are:

Spring, rain water, insects, the spring equinox, the tomb-sweeping day, grain rain, of summer, grain full, grain in ear, the summer solstice, slight heat and great heat, beginning of autumn, the limit of heat, the millennium, autumnal equinox, cold dew, frost, the beginning of winter, light snow, heavy snow, the winter solstice, slight cold, severe cold.

Above, in turn ShunShu every single for the throttle, referred to as "festival";Every double for gas, referred to as "gas", taken together, is called "solar term", generally referred to as nowThe 24 solar terms。

From astronomy sense, twenty-four solar terms is the earth's orbit around the sun (the ecliptic, oval) is divided into twenty-four equal, at vernal equinox is 0 points, such as every two point between 15 ° apart.To every cent point to determine the name of, such as they are in turn:

Twenty-four solar terms in each solar term has its specific climate and physical meaning, if from the point of view of gas, they all reflect the changing rule of the aura of the year, reflecting the aura of the changes of Yin and Yang, five elements.Eight words, therefore, the "month", is based on the distance between the two section as its length, as in the figure of eight to the distance between the adjacent two section and the section as a "month", this is different from the lunar month, also different from the current calendar month, this is we must find out the problem, don't understand this is impossible to discharge the right figure of eight.Using throttle set the month, 12 months a year only, won't appear leap month of the lunar calendar, it should be said that brought eight method is convenient, but want to make sure that every year a throttle the exact time is not an easy thing, the need for a more careful of astronomical observation and calculation, need to have extensive knowledge of astronomy.Therefore, in the history of the legendary fortune teller is often pass on astronomy, bottom know geography great scholars.Such as ShanDuan commands from a life and death of zhuge liang, liu bowen and others.Even today, social investigation, we found that the old fortune-teller (mostly) for the blind is also very proficient in the calendar and the knowledge of astronomy, from objectively they to spread and carry forward the traditional calendar played a positive role, in many cases, they are with the knowledge of astronomy, to reach the realm or omnifarious.